Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Convert to struct mnt_idmap.
Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.
Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.
Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Now that ecryptfs supports the get and set acl inode operations and the
vfs has been switched to the new posi api, ecryptfs can simply rely on
the stub posix acl handlers.
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
The current way of setting and getting posix acls through the generic
xattr interface is error prone and type unsafe. The vfs needs to
interpret and fixup posix acls before storing or reporting it to
userspace. Various hacks exist to make this work. The code is hard to
understand and difficult to maintain in it's current form. Instead of
making this work by hacking posix acls through xattr handlers we are
building a dedicated posix acl api around the get and set inode
operations. This removes a lot of hackiness and makes the codepaths
easier to maintain. A lot of background can be found in [1].
In order to build a type safe posix api around get and set acl we need
all filesystem to implement get and set acl.
So far ecryptfs didn't implement get and set acl inode operations
because it wanted easy access to the dentry. Now that we extended the
set acl inode operation to take a dentry argument and added a new get
acl inode operation that takes a dentry argument we can let ecryptfs
implement get and set acl inode operations.
Note, until the vfs has been switched to the new posix acl api this
patch is a non-functional change.
Link: https://lore.kernel.org/all/20220801145520.1532837-1-brauner@kernel.org [1]
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
The current way of setting and getting posix acls through the generic
xattr interface is error prone and type unsafe. The vfs needs to
interpret and fixup posix acls before storing or reporting it to
userspace. Various hacks exist to make this work. The code is hard to
understand and difficult to maintain in it's current form. Instead of
making this work by hacking posix acls through xattr handlers we are
building a dedicated posix acl api around the get and set inode
operations. This removes a lot of hackiness and makes the codepaths
easier to maintain. A lot of background can be found in [1].
In order to build a type safe posix api around get and set acl we need
all filesystem to implement get and set acl.
So far ecryptfs didn't implement get and set acl inode operations
because it wanted easy access to the dentry. Now that we extended the
set acl inode operation to take a dentry argument and added a new get
acl inode operation that takes a dentry argument we can let ecryptfs
implement get and set acl inode operations.
Note, until the vfs has been switched to the new posix acl api this
patch is a non-functional change.
Link: https://lore.kernel.org/all/20220801145520.1532837-1-brauner@kernel.org [1]
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
filldir_t instances (directory iterators callbacks) used to return 0 for
"OK, keep going" or -E... for "stop". Note that it's *NOT* how the
error values are reported - the rules for those are callback-dependent
and ->iterate{,_shared}() instances only care about zero vs. non-zero
(look at emit_dir() and friends).
So let's just return bool ("should we keep going?") - it's less confusing
that way. The choice between "true means keep going" and "true means
stop" is bikesheddable; we have two groups of callbacks -
do something for everything in directory, until we run into problem
and
find an entry in directory and do something to it.
The former tended to use 0/-E... conventions - -E<something> on failure.
The latter tended to use 0/1, 1 being "stop, we are done".
The callers treated anything non-zero as "stop", ignoring which
non-zero value did they get.
"true means stop" would be more natural for the second group; "true
means keep going" - for the first one. I tried both variants and
the things like
if allocation failed
something = -ENOMEM;
return true;
just looked unnatural and asking for trouble.
[folded suggestion from Matthew Wilcox <willy@infradead.org>]
Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This is a "weak" conversion which converts straight back to using pages.
A full conversion should be performed at some point, hopefully by
someone familiar with the filesystem.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
There are no more aop flags left, so remove the parameter.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
There are no more aop flags left, so remove the parameter.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Primarily this series converts some of the address_space operations
to take a folio instead of a page.
->is_partially_uptodate() takes a folio instead of a page and changes the
type of the 'from' and 'count' arguments to make it obvious they're bytes.
->invalidatepage() becomes ->invalidate_folio() and has a similar type change.
->launder_page() becomes ->launder_folio()
->set_page_dirty() becomes ->dirty_folio() and adds the address_space as
an argument.
There are a couple of other misc changes up front that weren't worth
separating into their own pull request.
-----BEGIN PGP SIGNATURE-----
iQEzBAABCgAdFiEEejHryeLBw/spnjHrDpNsjXcpgj4FAmI4hqMACgkQDpNsjXcp
gj7r7Af/fVJ7m8kKqjP/IayX3HiJRuIDQw+vM++BlRNXdjz+IyED6whdmFGxJeOY
BMyT+8ApOAz7ErS4G+7fAv4ScJK/aEgFUsnSeAiCp0PliiEJ5NNJzElp6sVmQ7H5
SX7+Ek444FZUGsQuy0qL7/ELpR3ditnD7x+5U2g0p5TeaHGUQn84crRyfR4xuhNG
EBD9D71BOb7OxUcOHe93pTkK51QsQ0aCrcIsB1tkK5KR0BAthn1HqF7ehL90Rvrr
omx5M7aDWGY4oj7IKrhlAs+55Ah2WaOzrZBp0FXNbr4UENDBKWKyUxErwa4xPkf6
Gm1iQG/CspOHnxN3YWsd5WjtlL3A+A==
=cOiq
-----END PGP SIGNATURE-----
Merge tag 'folio-5.18b' of git://git.infradead.org/users/willy/pagecache
Pull filesystem folio updates from Matthew Wilcox:
"Primarily this series converts some of the address_space operations to
take a folio instead of a page.
Notably:
- a_ops->is_partially_uptodate() takes a folio instead of a page and
changes the type of the 'from' and 'count' arguments to make it
obvious they're bytes.
- a_ops->invalidatepage() becomes ->invalidate_folio() and has a
similar type change.
- a_ops->launder_page() becomes ->launder_folio()
- a_ops->set_page_dirty() becomes ->dirty_folio() and adds the
address_space as an argument.
There are a couple of other misc changes up front that weren't worth
separating into their own pull request"
* tag 'folio-5.18b' of git://git.infradead.org/users/willy/pagecache: (53 commits)
fs: Remove aops ->set_page_dirty
fb_defio: Use noop_dirty_folio()
fs: Convert __set_page_dirty_no_writeback to noop_dirty_folio
fs: Convert __set_page_dirty_buffers to block_dirty_folio
nilfs: Convert nilfs_set_page_dirty() to nilfs_dirty_folio()
mm: Convert swap_set_page_dirty() to swap_dirty_folio()
ubifs: Convert ubifs_set_page_dirty to ubifs_dirty_folio
f2fs: Convert f2fs_set_node_page_dirty to f2fs_dirty_node_folio
f2fs: Convert f2fs_set_data_page_dirty to f2fs_dirty_data_folio
f2fs: Convert f2fs_set_meta_page_dirty to f2fs_dirty_meta_folio
afs: Convert afs_dir_set_page_dirty() to afs_dir_dirty_folio()
btrfs: Convert extent_range_redirty_for_io() to use folios
fs: Convert trivial uses of __set_page_dirty_nobuffers to filemap_dirty_folio
btrfs: Convert from set_page_dirty to dirty_folio
fscache: Convert fscache_set_page_dirty() to fscache_dirty_folio()
fs: Add aops->dirty_folio
fs: Remove aops->launder_page
orangefs: Convert launder_page to launder_folio
nfs: Convert from launder_page to launder_folio
fuse: Convert from launder_page to launder_folio
...
The inode allocation is supposed to use alloc_inode_sb(), so convert
kmem_cache_alloc() of all filesystems to alloc_inode_sb().
Link: https://lkml.kernel.org/r/20220228122126.37293-5-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Theodore Ts'o <tytso@mit.edu> [ext4]
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Alex Shi <alexs@kernel.org>
Cc: Anna Schumaker <Anna.Schumaker@Netapp.com>
Cc: Chao Yu <chao@kernel.org>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Fam Zheng <fam.zheng@bytedance.com>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kari Argillander <kari.argillander@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
With all implementations converted to ->dirty_folio, we can stop calling
this fallback method and remove it entirely.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Acked-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Tested-by: Mike Marshall <hubcap@omnibond.com> # orangefs
Tested-by: David Howells <dhowells@redhat.com> # afs
Convert all callers; mostly this is just changing the aops to point
at it, but a few implementations need a little more work.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Acked-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Tested-by: Mike Marshall <hubcap@omnibond.com> # orangefs
Tested-by: David Howells <dhowells@redhat.com> # afs
Remove special-casing of a NULL invalidatepage, since there is no
more block_invalidatepage.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Acked-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Tested-by: Mike Marshall <hubcap@omnibond.com> # orangefs
Tested-by: David Howells <dhowells@redhat.com> # afs
Multiple places open-code the same check to determine whether a given
mount is idmapped. Introduce a simple helper function that can be used
instead. This allows us to get rid of the fragile open-coding. We will
later change the check that is used to determine whether a given mount
is idmapped. Introducing a helper allows us to do this in a single
place instead of doing it for multiple places.
Link: https://lore.kernel.org/r/20211123114227.3124056-2-brauner@kernel.org (v1)
Link: https://lore.kernel.org/r/20211130121032.3753852-2-brauner@kernel.org (v2)
Link: https://lore.kernel.org/r/20211203111707.3901969-2-brauner@kernel.org
Cc: Seth Forshee <sforshee@digitalocean.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
CC: linux-fsdevel@vger.kernel.org
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Seth Forshee <sforshee@digitalocean.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Remove the CONFIG_BLOCK default to __set_page_dirty_buffers and just wire
that method up for the missing instances.
[hch@lst.de: ecryptfs: add a ->set_page_dirty cludge]
Link: https://lkml.kernel.org/r/20210624125250.536369-1-hch@lst.de
Link: https://lkml.kernel.org/r/20210614061512.3966143-4-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Tyler Hicks <code@tyhicks.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
crypt_stat memory itself is allocated when inode is created, in
ecryptfs_alloc_inode, which returns NULL on failure and is handled
by callers, which would prevent us getting to this point. It then
calls ecryptfs_init_crypt_stat which allocates crypt_stat->tfm
checking for and likewise handling allocation failure. Finally,
crypt_stat->flags has ECRYPTFS_STRUCT_INITIALIZED merged into it
in ecryptfs_init_crypt_stat as well.
Simply put, the conditions that the BUG_ON checks for will never
be triggered, as to even get to this function, the relevant conditions
will have already been fulfilled (or the inode allocation would fail in
the first place and thus no call to this function or those above it).
Cc: Tyler Hicks <code@tyhicks.com>
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20210503115736.2104747-50-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This reverts commit 2c2a7552dd.
Because of recent interactions with developers from @umn.edu, all
commits from them have been recently re-reviewed to ensure if they were
correct or not.
Upon review, this commit was found to be incorrect for the reasons
below, so it must be reverted. It will be fixed up "correctly" in a
later kernel change.
The original commit log for this change was incorrect, no "error
handling code" was added, things will blow up just as badly as before if
any of these cases ever were true. As this BUG_ON() never fired, and
most of these checks are "obviously" never going to be true, let's just
revert to the original code for now until this gets unwound to be done
correctly in the future.
Cc: Aditya Pakki <pakki001@umn.edu>
Fixes: 2c2a7552dd ("ecryptfs: replace BUG_ON with error handling code")
Cc: stable <stable@vger.kernel.org>
Acked-by: Tyler Hicks <code@tyhicks.com>
Link: https://lore.kernel.org/r/20210503115736.2104747-49-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
- W=1 compiler warning cleanups
- Mutex initialization simplification
- Protect against NULL pointer exception during mount
-----BEGIN PGP SIGNATURE-----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=aHZx
-----END PGP SIGNATURE-----
Merge tag 'ecryptfs-5.13-rc1-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs
Pull ecryptfs updates from Tyler Hicks:
"Code cleanups and a bug fix
- W=1 compiler warning cleanups
- Mutex initialization simplification
- Protect against NULL pointer exception during mount"
* tag 'ecryptfs-5.13-rc1-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs:
ecryptfs: fix kernel panic with null dev_name
ecryptfs: remove unused helpers
ecryptfs: Fix typo in message
eCryptfs: Use DEFINE_MUTEX() for mutex lock
ecryptfs: keystore: Fix some kernel-doc issues and demote non-conformant headers
ecryptfs: inode: Help out nearly-there header and demote non-conformant ones
ecryptfs: mmap: Help out one function header and demote other abuses
ecryptfs: crypto: Supply some missing param descriptions and demote abuses
ecryptfs: miscdev: File headers are not good kernel-doc candidates
ecryptfs: main: Demote a bunch of non-conformant kernel-doc headers
ecryptfs: messaging: Add missing param descriptions and demote abuses
ecryptfs: super: Fix formatting, naming and kernel-doc abuses
ecryptfs: file: Demote kernel-doc abuses
ecryptfs: kthread: Demote file header and provide description for 'cred'
ecryptfs: dentry: File headers are not good candidates for kernel-doc
ecryptfs: debug: Demote a couple of kernel-doc abuses
ecryptfs: read_write: File headers do not make good candidates for kernel-doc
ecryptfs: use DEFINE_MUTEX() for mutex lock
eCryptfs: add a semicolon
Pull exryptfs updates from Al Viro:
"The interesting part here is (ecryptfs) lock_parent() fixes - its
treatment of ->d_parent had been very wrong.
The rest is trivial cleanups"
* 'work.ecryptfs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
ecryptfs: ecryptfs_dentry_info->crypt_stat is never used
ecryptfs: get rid of unused accessors
ecryptfs: saner API for lock_parent()
ecryptfs: get rid of pointless dget/dput in ->symlink() and ->link()
When mounting eCryptfs, a null "dev_name" argument to ecryptfs_mount()
causes a kernel panic if the parsed options are valid. The easiest way to
reproduce this is to call mount() from userspace with an existing
eCryptfs mount's options and a "source" argument of 0.
Error out if "dev_name" is null in ecryptfs_mount()
Fixes: 237fead619 ("[PATCH] ecryptfs: fs/Makefile and fs/Kconfig")
Cc: stable@vger.kernel.org
Signed-off-by: Jeffrey Mitchell <jeffrey.mitchell@starlab.io>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
mutex lock can be initialized automatically with DEFINE_MUTEX()
rather than explicitly calling mutex_init().
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Ye Bin <yebin10@huawei.com>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Fixes the following W=1 kernel build warning(s):
fs/ecryptfs/keystore.c:25: warning: Incorrect use of kernel-doc format: * request_key returned an error instead of a valid key address;
fs/ecryptfs/keystore.c:30: warning: Function parameter or member 'err_code' not described in 'process_request_key_err'
fs/ecryptfs/keystore.c:30: warning: expecting prototype for eCryptfs(). Prototype was for process_request_key_err() instead
fs/ecryptfs/keystore.c:558: warning: Function parameter or member 'auth_tok_key' not described in 'ecryptfs_find_auth_tok_for_sig'
fs/ecryptfs/keystore.c:558: warning: Function parameter or member 'mount_crypt_stat' not described in 'ecryptfs_find_auth_tok_for_sig'
fs/ecryptfs/keystore.c:558: warning: Excess function parameter 'crypt_stat' description in 'ecryptfs_find_auth_tok_for_sig'
fs/ecryptfs/keystore.c:584: warning: cannot understand function prototype: 'struct ecryptfs_write_tag_70_packet_silly_stack '
fs/ecryptfs/keystore.c:622: warning: Function parameter or member 'dest' not described in 'ecryptfs_write_tag_70_packet'
fs/ecryptfs/keystore.c:622: warning: Function parameter or member 'remaining_bytes' not described in 'ecryptfs_write_tag_70_packet'
fs/ecryptfs/keystore.c:622: warning: Function parameter or member 'packet_size' not described in 'ecryptfs_write_tag_70_packet'
fs/ecryptfs/keystore.c:622: warning: Function parameter or member 'mount_crypt_stat' not described in 'ecryptfs_write_tag_70_packet'
fs/ecryptfs/keystore.c:622: warning: Function parameter or member 'filename_size' not described in 'ecryptfs_write_tag_70_packet'
fs/ecryptfs/keystore.c:622: warning: expecting prototype for write_tag_70_packet(). Prototype was for ecryptfs_write_tag_70_packet() instead
fs/ecryptfs/keystore.c:895: warning: expecting prototype for parse_tag_70_packet(). Prototype was for ecryptfs_parse_tag_70_packet() instead
Cc: Tyler Hicks <code@tyhicks.com>
Cc: "Michael A. Halcrow" <mhalcrow@us.ibm.com>
Cc: "Michael C. Thompson" <mcthomps@us.ibm.com>
Cc: "Trevor S. Highland" <trevor.highland@gmail.com>
Cc: ecryptfs@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Fixes the following W=1 kernel build warning(s):
fs/ecryptfs/inode.c:27: warning: Function parameter or member 'dentry' not described in 'lock_parent'
fs/ecryptfs/inode.c:27: warning: Function parameter or member 'lower_dentry' not described in 'lock_parent'
fs/ecryptfs/inode.c:27: warning: Function parameter or member 'lower_dir' not described in 'lock_parent'
fs/ecryptfs/inode.c:27: warning: expecting prototype for eCryptfs(). Prototype was for lock_parent() instead
fs/ecryptfs/inode.c:211: warning: Function parameter or member 'ecryptfs_dentry' not described in 'ecryptfs_initialize_file'
fs/ecryptfs/inode.c:211: warning: Function parameter or member 'ecryptfs_inode' not described in 'ecryptfs_initialize_file'
fs/ecryptfs/inode.c:258: warning: Function parameter or member 'mnt_userns' not described in 'ecryptfs_create'
fs/ecryptfs/inode.c:258: warning: Function parameter or member 'directory_inode' not described in 'ecryptfs_create'
fs/ecryptfs/inode.c:258: warning: Function parameter or member 'ecryptfs_dentry' not described in 'ecryptfs_create'
fs/ecryptfs/inode.c:258: warning: Function parameter or member 'excl' not described in 'ecryptfs_create'
fs/ecryptfs/inode.c:258: warning: Excess function parameter 'dir' description in 'ecryptfs_create'
fs/ecryptfs/inode.c:258: warning: Excess function parameter 'dentry' description in 'ecryptfs_create'
fs/ecryptfs/inode.c:320: warning: Function parameter or member 'dentry' not described in 'ecryptfs_lookup_interpose'
fs/ecryptfs/inode.c:320: warning: Function parameter or member 'lower_dentry' not described in 'ecryptfs_lookup_interpose'
fs/ecryptfs/inode.c:887: warning: Function parameter or member 'mnt_userns' not described in 'ecryptfs_setattr'
Cc: Tyler Hicks <code@tyhicks.com>
Cc: "Michael A. Halcrow" <mahalcro@us.ibm.com>
Cc: "Michael C. Thompsion" <mcthomps@us.ibm.com>
Cc: ecryptfs@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Fixes the following W=1 kernel build warning(s):
fs/ecryptfs/mmap.c:26: warning: Incorrect use of kernel-doc format: * ecryptfs_get_locked_page
fs/ecryptfs/mmap.c:34: warning: Function parameter or member 'inode' not described in 'ecryptfs_get_locked_page'
fs/ecryptfs/mmap.c:34: warning: Function parameter or member 'index' not described in 'ecryptfs_get_locked_page'
fs/ecryptfs/mmap.c:34: warning: expecting prototype for eCryptfs(). Prototype was for ecryptfs_get_locked_page() instead
fs/ecryptfs/mmap.c:52: warning: Function parameter or member 'wbc' not described in 'ecryptfs_writepage'
fs/ecryptfs/mmap.c:98: warning: Incorrect use of kernel-doc format: * ecryptfs_copy_up_encrypted_with_header
fs/ecryptfs/mmap.c:110: warning: Function parameter or member 'page' not described in 'ecryptfs_copy_up_encrypted_with_header'
fs/ecryptfs/mmap.c:110: warning: Function parameter or member 'crypt_stat' not described in 'ecryptfs_copy_up_encrypted_with_header'
fs/ecryptfs/mmap.c:110: warning: expecting prototype for Header Extent(). Prototype was for ecryptfs_copy_up_encrypted_with_header() instead
fs/ecryptfs/mmap.c:233: warning: wrong kernel-doc identifier on line:
fs/ecryptfs/mmap.c:379: warning: Function parameter or member 'ecryptfs_inode' not described in 'ecryptfs_write_inode_size_to_header'
Cc: Tyler Hicks <code@tyhicks.com>
Cc: James Morris <jamorris@linux.microsoft.com>
Cc: Tycho Andersen <tycho@tycho.pizza>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: "Michael A. Halcrow" <mahalcro@us.ibm.com>
Cc: ecryptfs@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Fixes the following W=1 kernel build warning(s):
fs/ecryptfs/crypto.c:29: warning: expecting prototype for eCryptfs(). Prototype was for DECRYPT() instead
fs/ecryptfs/crypto.c:360: warning: Function parameter or member 'crypt_stat' not described in 'lower_offset_for_page'
fs/ecryptfs/crypto.c:360: warning: Function parameter or member 'page' not described in 'lower_offset_for_page'
fs/ecryptfs/crypto.c:637: warning: Function parameter or member 'crypt_stat' not described in 'ecryptfs_compute_root_iv'
fs/ecryptfs/crypto.c:1386: warning: Function parameter or member 'ecryptfs_dentry' not described in 'ecryptfs_read_metadata'
fs/ecryptfs/crypto.c:1463: warning: Function parameter or member 'filename' not described in 'ecryptfs_encrypt_filename'
fs/ecryptfs/crypto.c:1463: warning: Function parameter or member 'mount_crypt_stat' not described in 'ecryptfs_encrypt_filename'
fs/ecryptfs/crypto.c:1897: warning: Function parameter or member 'encoded_name_size' not described in 'ecryptfs_encrypt_and_encode_filename'
fs/ecryptfs/crypto.c:1897: warning: Function parameter or member 'mount_crypt_stat' not described in 'ecryptfs_encrypt_and_encode_filename'
fs/ecryptfs/crypto.c:1897: warning: Function parameter or member 'name_size' not described in 'ecryptfs_encrypt_and_encode_filename'
fs/ecryptfs/crypto.c:1897: warning: Excess function parameter 'crypt_stat' description in 'ecryptfs_encrypt_and_encode_filename'
fs/ecryptfs/crypto.c:1897: warning: Excess function parameter 'length' description in 'ecryptfs_encrypt_and_encode_filename'
fs/ecryptfs/crypto.c:2006: warning: Function parameter or member 'sb' not described in 'ecryptfs_decode_and_decrypt_filename'
fs/ecryptfs/crypto.c:2006: warning: Excess function parameter 'ecryptfs_dir_dentry' description in 'ecryptfs_decode_and_decrypt_filename'
Cc: Tyler Hicks <code@tyhicks.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: "Michael A. Halcrow" <mahalcro@us.ibm.com>
Cc: "Michael C. Thompson" <mcthomps@us.ibm.com>
Cc: ecryptfs@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
[tyhicks: Fix typo in ecryptfs_encrypt_and_encode_filename() func docs]
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Supply description for the 'daemon' param too.
Fixes the following W=1 kernel build warning(s):
fs/ecryptfs/miscdev.c:19: warning: cannot understand function prototype: 'atomic_t ecryptfs_num_miscdev_opens; '
fs/ecryptfs/miscdev.c:323: warning: Function parameter or member 'daemon' not described in 'ecryptfs_miscdev_response'
Cc: Tyler Hicks <code@tyhicks.com>
Cc: "Michael A. Halcrow" <mhalcrow@us.ibm.com>
Cc: ecryptfs@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Fixes the following W=1 kernel build warning(s):
fs/ecryptfs/main.c:28: warning: Incorrect use of kernel-doc format: * Module parameter that defines the ecryptfs_verbosity level.
fs/ecryptfs/main.c:30: warning: cannot understand function prototype: 'int ecryptfs_verbosity = 0; '
fs/ecryptfs/main.c:40: warning: cannot understand function prototype: 'unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS; '
fs/ecryptfs/main.c:52: warning: cannot understand function prototype: 'signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ; '
fs/ecryptfs/main.c:65: warning: cannot understand function prototype: 'unsigned int ecryptfs_number_of_users = ECRYPTFS_DEFAULT_NUM_USERS; '
fs/ecryptfs/main.c:106: warning: Function parameter or member 'dentry' not described in 'ecryptfs_init_lower_file'
fs/ecryptfs/main.c:106: warning: Function parameter or member 'lower_file' not described in 'ecryptfs_init_lower_file'
fs/ecryptfs/main.c:106: warning: Excess function parameter 'ecryptfs_dentry' description in 'ecryptfs_init_lower_file'
fs/ecryptfs/main.c:244: warning: Function parameter or member 'sbi' not described in 'ecryptfs_parse_options'
fs/ecryptfs/main.c:244: warning: Excess function parameter 'sb' description in 'ecryptfs_parse_options'
fs/ecryptfs/main.c:478: warning: Function parameter or member 'fs_type' not described in 'ecryptfs_mount'
fs/ecryptfs/main.c:478: warning: Function parameter or member 'flags' not described in 'ecryptfs_mount'
fs/ecryptfs/main.c:478: warning: expecting prototype for ecryptfs_get_sb(). Prototype was for ecryptfs_mount() instead
fs/ecryptfs/main.c:645: warning: Function parameter or member 'vptr' not described in 'inode_info_init_once'
Cc: Tyler Hicks <code@tyhicks.com>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: James Morris <jamorris@linux.microsoft.com>
Cc: "Michael A. Halcrow" <mahalcro@us.ibm.com>
Cc: "Michael C. Thompson" <mcthomps@us.ibm.com>
Cc: ecryptfs@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
[tyhicks: Correct the function documentation for ecryptfs_mount()]
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Fixes the following W=1 kernel build warning(s):
fs/ecryptfs/messaging.c:15: warning: Function parameter or member 'ecryptfs_msg_ctx_free_list' not described in 'LIST_HEAD'
fs/ecryptfs/messaging.c:15: warning: expecting prototype for eCryptfs(). Prototype was for LIST_HEAD() instead
fs/ecryptfs/messaging.c:157: warning: Function parameter or member 'daemon' not described in 'ecryptfs_exorcise_daemon'
fs/ecryptfs/messaging.c:207: warning: Function parameter or member 'daemon' not described in 'ecryptfs_process_response'
fs/ecryptfs/messaging.c:207: warning: expecting prototype for ecryptfs_process_reponse(). Prototype was for ecryptfs_process_response() instead
fs/ecryptfs/messaging.c:262: warning: Function parameter or member 'msg_type' not described in 'ecryptfs_send_message_locked'
Cc: Tyler Hicks <code@tyhicks.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: "Michael A. Halcrow" <mhalcrow@us.ibm.com>
Cc: ecryptfs@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Fixes the following W=1 kernel build warning(s):
fs/ecryptfs/super.c:22: warning: cannot understand function prototype: 'struct kmem_cache *ecryptfs_inode_info_cache; '
fs/ecryptfs/super.c:91: warning: Function parameter or member 'dentry' not described in 'ecryptfs_statfs'
fs/ecryptfs/super.c:91: warning: Excess function parameter 'sb' description in 'ecryptfs_statfs'
fs/ecryptfs/super.c:120: warning: Function parameter or member 'inode' not described in 'ecryptfs_evict_inode'
fs/ecryptfs/super.c:133: warning: Function parameter or member 'm' not described in 'ecryptfs_show_options'
fs/ecryptfs/super.c:133: warning: Function parameter or member 'root' not described in 'ecryptfs_show_options'
Cc: Tyler Hicks <code@tyhicks.com>
Cc: "Michael A. Halcrow" <mahalcro@us.ibm.com>
Cc: "Michael C. Thompson" <mcthomps@us.ibm.com>
Cc: ecryptfs@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Fixes the following W=1 kernel build warning(s):
fs/ecryptfs/file.c:23: warning: Incorrect use of kernel-doc format: * ecryptfs_read_update_atime
fs/ecryptfs/file.c:34: warning: Function parameter or member 'iocb' not described in 'ecryptfs_read_update_atime'
fs/ecryptfs/file.c:34: warning: Function parameter or member 'to' not described in 'ecryptfs_read_update_atime'
fs/ecryptfs/file.c:34: warning: expecting prototype for eCryptfs(). Prototype was for ecryptfs_read_update_atime() instead
Cc: Tyler Hicks <code@tyhicks.com>
Cc: "Michael A. Halcrow" <mhalcrow@us.ibm.com>
Cc: "Michael C. Thompson" <mcthomps@us.ibm.com>
Cc: ecryptfs@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Fixes the following W=1 kernel build warning(s):
fs/ecryptfs/kthread.c:16: warning: cannot understand function prototype: 'struct ecryptfs_open_req '
fs/ecryptfs/kthread.c:120: warning: Function parameter or member 'cred' not described in 'ecryptfs_privileged_open'
Cc: Tyler Hicks <code@tyhicks.com>
Cc: "Michael A. Halcrow" <mahalcro@us.ibm.com>
Cc: ecryptfs@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Fixes the following W=1 kernel build warning(s):
fs/ecryptfs/dentry.c:19: warning: Incorrect use of kernel-doc format: * ecryptfs_d_revalidate - revalidate an ecryptfs dentry
fs/ecryptfs/dentry.c:32: warning: Function parameter or member 'dentry' not described in 'ecryptfs_d_revalidate'
fs/ecryptfs/dentry.c:32: warning: Function parameter or member 'flags' not described in 'ecryptfs_d_revalidate'
fs/ecryptfs/dentry.c:32: warning: expecting prototype for eCryptfs(). Prototype was for ecryptfs_d_revalidate() instead
Cc: Tyler Hicks <code@tyhicks.com>
Cc: "Michael A. Halcrow" <mahalcro@us.ibm.com>
Cc: ecryptfs@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Fixes the following W=1 kernel build warning(s):
fs/ecryptfs/debug.c:13: warning: Incorrect use of kernel-doc format: * ecryptfs_dump_auth_tok - debug function to print auth toks
fs/ecryptfs/debug.c:19: warning: Function parameter or member 'auth_tok' not described in 'ecryptfs_dump_auth_tok'
fs/ecryptfs/debug.c:19: warning: expecting prototype for eCryptfs(). Prototype was for ecryptfs_dump_auth_tok() instead
Cc: Tyler Hicks <code@tyhicks.com>
Cc: "Michael A. Halcrow" <mahalcro@us.ibm.com>
Cc: ecryptfs@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Provide missing param description for 'page_index' too.
Fixes the following W=1 kernel build warning(s):
fs/ecryptfs/read_write.c:16: warning: Incorrect use of kernel-doc format: * ecryptfs_write_lower
fs/ecryptfs/read_write.c:29: warning: Function parameter or member 'ecryptfs_inode' not described in 'ecryptfs_write_lower'
fs/ecryptfs/read_write.c:29: warning: Function parameter or member 'data' not described in 'ecryptfs_write_lower'
fs/ecryptfs/read_write.c:29: warning: Function parameter or member 'offset' not described in 'ecryptfs_write_lower'
fs/ecryptfs/read_write.c:29: warning: Function parameter or member 'size' not described in 'ecryptfs_write_lower'
fs/ecryptfs/read_write.c:29: warning: expecting prototype for eCryptfs(). Prototype was for ecryptfs_write_lower() instead
fs/ecryptfs/read_write.c:248: warning: Function parameter or member 'page_index' not described in 'ecryptfs_read_lower_page_segment'
Cc: Tyler Hicks <code@tyhicks.com>
Cc: "Michael A. Halcrow" <mahalcro@us.ibm.com>
Cc: ecryptfs@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
-----BEGIN PGP SIGNATURE-----
iQFSBAABCAA8FiEEq68RxlopcLEwq+PEeb4+QwBBGIYFAmBzdS0eHHRvcnZhbGRz
QGxpbnV4LWZvdW5kYXRpb24ub3JnAAoJEHm+PkMAQRiGDdAIAIpKH/tAHhH7s7QH
m5ewgE8foP7M5Ue9fp3+JmbtaYSzhCAMcKhqGtat/zk5PvA9AoYCDXrTetfYtBHh
LUOmhL9hcKItNobfkYBok6BiFjGUEL3HMqz5w+MUsMwnXIc4RXqfJmsQ932z9Kxf
yDwe6ehIzJVrQLI/C0mTamYRHu2aiZ1VWzhKuT493rLeg0R2odCCIClPN+/QvCwb
8/sk6l1c8eOUYYMUzKFZifaZGb12qDjRt4pZmk51aMTzg0WCpElJG+7Uqr4QQhZP
p6xeNuUQq6WwxtlDkmo79Uzkrurb5tN2/hZ1RcJhs3EdHfpR0MjIyH3Znnb31gnu
39VjHhg=
=4KP/
-----END PGP SIGNATURE-----
Merge tag 'v5.12-rc7' into ecryptfs/next
Required to pick up idmapped mount changes which changed some function
parameters.
Switch all users of lock_parent() to the approach used by ->unlink()
and ->rmdir() - instead of playing with dget_parent() of underlying
dentry of child,
* start with ecryptfs dentry of child.
* find underlying dentries for that dentry and its parent
(which is stable, since the parent directory in upper layer is
held at least shared). No need to pin them, they are already pinned
by ecryptfs dentries.
* lock the inode of undelying directory of parent
* check if it's the parent of underlying dentry of child.
->d_parent of underlying dentry of child might be unstable. However,
result of its comparison with underlying dentry of parent *is* stable now.
Turn that into replacement of lock_parent(), convert the existing callers
of lock_parent() to that, along with ecryptfs_unlink() and ecryptfs_rmdir().
Callers need only the underlying dentry of child and inode of underlying
dentry of parent, so lock_parent() passes those to the caller now.
Note that underlying directory is locked in any case, success or failure.
That approach does not need a primitive for unlocking - we hadn't grabbed
any dentry references, so all we need is to unlock the underlying directory
inode.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
